Thank you for reviewing!
I was trying to mimic Bastionland’s style of not explicitly spelling things out in module, so that different tables could interpret things as they see it. The way I wrote, however, is that being unmasked does strike down everyone except The Sister & Giltaan, who are life-linked. Giltaan giving his Mask for the temple is kinda like hibernation, while The Sister would die (as she desires) if Giltaan’s were taken forcibly. As for the barrier, it would fall immediately after Giltaan’s is removed, but I tried to imply that it would rise again around whatever temple the PC’s found if his deal were taken. I hope that makes more sense with the context you already had, but please let me know if none of that came across!